Day‐Neutrality in Soybeans1

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Abstract
The north‐south range of adaptation of soybean [Glycine max (L.) Merr.] varieties is limited because of the photopcriod requirements for anthesis. If daylengthneutral strains could be identified and used in soybean breeding programs, the range of adaptability of soybean varieties might be considerably increased. The U. S. world collection of soybeans of maturity groups 00 and 0 (about 400 strains) was screened for dayneutrality by growing the plants at various photoperiods in the greenhouse. Strains that flowered in the greenhouse in about the same number of days under photopcriods ranging from 12 to 22 hours were identified. Several strains thus identified were also day‐neutral with respect to flowering in a field experiment in which various photoperiods were established. Under the field conditions, however, some of the day‐neutral strains were delayed in maturity mote than others by the long photoperiods.

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